Sanitary chalk-trough screen.



F. W. ROBISON. SANITARY GHALK TROUGH SCREEN. APPLICATION .FILED JUNI: a,1913.

1,097,468. Patented May 19, 1914.

gnou/14km,

wi/bmemo coLpMmA PLANQURAPH co..w^smNGToN. u. Y

.FRANK W'. RGBSON, QF IPOLTQN, ILLENOIS.

SANTARY CHALK-TROUGH SCREEN,

Learners.

Specification of Letters Patent.

Application tiled .Tune 3, 1913.

Patented May iti, 1914:. sei-iai im. masa To all whom 'it may conce-MiBe it known that l, FRANK W. Roinson, a citizen of the United States,residing at Dolton, in the county of Cook and State of illinois, haveinvented new and useful lmprovements in Sanitary Chalk Trough Screens,of which the following is a specification.

This invention relates to chalk trough screens the object in view beingto provide a sanitary screen for the chalk troughs used in connectionwith blaekboards for catching the chalk dust falling from the board andfrom the brush used for cleaning off the board.

The principal aim of the present invention is to produce a simple, cheapand effective screen for the purpose stated, combined with novel meansfor fastening said screen to the chalk trough, to enable the screen tobe turned over from its normal position to a hanging er pending positionat the front edge of the trough during the operation of moving theaccumulated chalk dust from the trough.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts, as will hereinafterbe more fully described, illustrated and claimed.

In the accompanying drawings Figure l is a perspective view of a portionof a blackboard and chalk trough, showing the screen of this inventionapplied thereto and in its operative position. Fig. 2 is a similar viewshowing' the screen thrown back to its pendent position. Fig. 3 is anenlarged detail view of one of the devices for fastening the screen tothe trough.

Referring to the drawings l designates a blackboard, 2 a chalk troughsecured to the bottom thereof and extending outwardly therefrom and 3the screen of this invention.

The body of the screen 3 is formed preferably of galvanized or japannedmesh wire fabric as indicated at i and in carrying out this invention,said screen is provided along one of its longitudinal edges with alaterally bent portion or flange 5, which, when the screen is in itsoperative position stands upwardly from the outer edge of the body ofthe screen as shown in Fig. l.

Extending along' the marginal edge of the upturned flange 5 is a wire Gconsiderably heavier than the wire of which the body of the screen isformed, the wire G serving to reinforce the upturned edge of the screenand also acting as a hinge pin as will hereinafter appear.

in connection with the screen, any desired number of fastening' devicesare employed, one of said fastening devices being illustrated in detailin Fig. 3 wherein it will be observed that said fastening deviceresembles somewhat a screw-eye in that it comprises a threaded shank 7and an eye portion 8 formed integrally `with the shank. The fastening'device shown in Fig. 3 differs, however, from the ordinary screw-eye inthat it is provided with a downwardly offset portion 9 forming a dropstep in which the wire G above referred to seats itself when the screenis in its operative position. rllhis prevents the wire G from movingabout loosely in the eye 8, the wire 6 being held in the steps 9 of theseveral fastening devices `which fastening devices are screwed into theouter edge portion of the trough 2 as indicated in Figs. l and 2. Byreason of the particular shape of the wire screen, that is to say, bye-ason of the upturned flange 5, combined in the manner set fort-h witheach fastening device, the screen may be turned over from the positionillustrated in Fig. i to the posit-ion illustrated in Fig. 2, saidflange permitting the main body portion of the screen to hang pendentfrom the outer edge of the trough as shown in Fig. 1, the inner andouter edges thereof resting directly on the corresponding portions ofthe trough and thereby preventing the chalk dust from finding its wayoutwardly between the screen and the edges of the trough. In other wordsthe construction described insures a close contact between the screenand the upstanding edge portions or flanges 10 of the trough.

What is claimed is 1. The combination with a chalk trough, of fasteningdevices secured to the outer edge of the trough and provided with eyes,and a screen normally resting on the outer and inner edges of the troughand provided along its outer edge with an upstanding flange, the upperedge of which passes through the eyes of the fastening device.

2. rThe combination with a chalk trough, ot' fastening devices securedalong the outer edge thereof, and a screen normally resting on the innerand outer edges of the trough and embodying an upstanding flange alongits outer edge, and n hinge .Wire extending n testimony whereof afx mysignature along the upper edge of sald flange and pass- 1n presence ofLmvo Wltnesses. 111g through Saud fasenmg devloes, Where Y Y T by thescreen is hinged to the trough and FRANK Wv ROBISOD" adapted to heturned from its operative to Vtnesses:

a pendent position, substantially as de- HORACE Homms,

scribed. JOHN HARMS, Jr.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

